the science is good. two main issues here. diet drinks and sugar drinks, refined drinks are not good for the brain. you get very high levels and low levels. blood sugar is all over the place. so if your sugar levels can cause depression and cause fatigue or insomnia. we know they contain a lot of artificial sweeteners and are nerve toxins to the brain. this drops serotonin that is related to depression. >> shep: is what the deal with fruit drinks, corn syrup? >> partly that but also its toxin. >> so we should drink water? >> the study is preliminary data that has come out today and it will be published in journals, but think there is evidence we need to be careful not to cut down on sugar drinks and diet sodas but also to cut down on refined sugars and eat a healthy diet. >> shep: it feels like were en route, sorry, your soda days are over. >> i think his study was not limited to sugar drinks and diet soda. the depression rates are hire. >> shep: is what depressing you have to buy two drinks, that is what is depressing. [ laug